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[libc] Add compile tests for each public header #122527

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merged 9 commits into from
Jan 12, 2025
Merged

[libc] Add compile tests for each public header #122527

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cc2061a
[libc] Add compile tests for each public header
frobtech Jan 10, 2025
91da76c
add mising file
frobtech Jan 10, 2025
56d789a
Use HERMETIC_TEST_ONLY, not UNIT_TEST_ONLY
frobtech Jan 10, 2025
76b24bb
Reformat template
frobtech Jan 10, 2025
1370e51
Use a single main declaration.
frobtech Jan 10, 2025
cfa89f6
Merge branch 'main' into p/libc-header-tests
frobtech Jan 10, 2025
36c1dc3
Use -Wsystem-headers; fix license typo.
frobtech Jan 11, 2025
ca8e8cd
Merge branch 'main' into p/libc-header-tests
frobtech Jan 11, 2025
57ee7ea
Merge remote-tracking branch 'refs/remotes/fork/p/libc-header-tests' …
frobtech Jan 11, 2025
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2 changes: 2 additions & 0 deletions libc/cmake/modules/LLVMLibCHeaderRules.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,7 @@ function(add_header target_name)
set_target_properties(
${fq_target_name}
PROPERTIES
HEADER_NAME ${dest_leaf_filename}
HEADER_FILE_PATH ${dest_file}
DEPS "${fq_deps_list}"
)
Expand Down Expand Up @@ -164,6 +165,7 @@ function(add_gen_header target_name)
set_target_properties(
${fq_target_name}
PROPERTIES
HEADER_NAME ${ADD_GEN_HDR_GEN_HDR}
HEADER_FILE_PATH ${out_file}
DECLS_FILE_PATH "${decl_out_file}"
DEPS "${fq_deps_list}"
Expand Down
68 changes: 67 additions & 1 deletion libc/test/include/CMakeLists.txt
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Expand Up @@ -422,7 +422,7 @@ add_libc_test(
-Werror
DEPENDS
libc.include.llvm-libc-macros.math_function_macros
)
)

add_libc_test(
isfinite_c_test
Expand Down Expand Up @@ -483,3 +483,69 @@ add_libc_test(
DEPENDS
libc.include.llvm-libc-macros.math_function_macros
)

# Test `#include <...>` of each header in each available language mode.
# This is gated on -DLLVM_LIBC_BUILD_HEADER_TESTS=ON until all the bugs
# in headers are fixed so the tests all compile.
set(TEST_STDC_VERSIONS 89;99;11;17;23)
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set(TEST_STDCXX_VERSIONS 03;11;14;17;20;23;26)

function(add_header_test target_name source_file deps std_mode)
if(LLVM_LIBC_BUILD_HEADER_TESTS)
add_libc_test(
${target_name}
C_TEST
HERMETIC_TEST_ONLY
SUITE
libc_include_tests
SRCS
${source_file}
COMPILE_OPTIONS
-Werror
-Wall
-Wextra
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Do you need to be setting -Wsystem-headers?

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I don't think we need to, but it shouldn't hurt. I'll try it.

These will only be considered "system headers" by the compiler if they're found in a directory that's put on the path with -isystem rather than -I or -idirafter or anything else. AFAICT we use -isystem for the clang headers (the ones copied from clang/lib/Headers) but not for our own. So if I'm right, then using -Wsystem-headers here will only make things fail if the clang headers are not warning-clean, not the libc headers. (I personally am a big fan of thorough warning-clean behavior and -Wsystem-headers, but many headers both in OS installs and perhaps clang and libc++ headers are not actually warning clean in my experience, unfortunately.) For the libc headers, -idirafter is actually the right thing to be using IMHO. But it only really matters to use that instead of -I if you're using toolchain-supplied libc++ headers, which the libc cmake build does not.

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I am wrong! I'm not sure yet how we're plumbing things, but we are getting the system header exception for the libc headers. And boy howdy do we need it! To start with, every file uses // comments that -std=c89 rejects. But there are many other issues that look like real bugs. So I think I will indeed turn it on, and the list of fixes needed to get these tests passing is even longer than we thought.

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From what I can recall, the use of <> vs "" for #include preprocessor directives changes one of the numbers in the generated line markers. Those control whether the diagnostic is considered from a system header or not. Unless -Wsystem-headers is set, such diagnostics are elided rather than emitted. There's a few other command line flags, a pragma, and specific system directories that can change this, too. I remember setting it once, seeing the additional diagnostics from my system headers, and thinking "ok, well, won't be fixing those any time soon, better leave that warning flag off for now..."

-std=${std_mode}
DEPENDS
${deps}
)
endif()
endfunction()

foreach(target ${TARGET_PUBLIC_HEADERS})
string(REPLACE "libc.include." "" header ${target})
get_target_property(HEADER_NAME ${target} HEADER_NAME)

set(test_stdc_file "${CMAKE_CURRENT_BINARY_DIR}/${header}_test.c")
configure_file(header-test-template.c ${test_stdc_file} @ONLY)
foreach(stdc_version ${TEST_STDC_VERSIONS})
add_header_test(
"${header}_c${stdc_version}_test"
${test_stdc_file}
${target}
"c${stdc_version}"
)
add_header_test(
"${header}_gnu${stdc_version}_test"
${test_stdc_file}
${target}
"gnu${stdc_version}"
)
endforeach()

set(test_stdcxx_file "${CMAKE_CURRENT_BINARY_DIR}/${header}_test.cpp")
configure_file(header-test-template.c ${test_stdcxx_file} @ONLY)
foreach(stdcxx_version ${TEST_STDCXX_VERSIONS})
add_header_test(
"${header}_cpp${stdcxx_version}_test"
${test_stdcxx_file}
${target}
"c++${stdcxx_version}"
)
add_header_test(
"${header}_gnucpp${stdcxx_version}_test"
${test_stdcxx_file}
${target}
"gnu++${stdcxx_version}"
)
endforeach()
endforeach()
14 changes: 14 additions & 0 deletions libc/test/include/header-test-template.c
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@@ -0,0 +1,14 @@
/*===-- Test for <@HEADER_NAME@> ----------------------------------------===
*
* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
* See https://llvm.org/LICENSE.txt for license information.
* SPDSList-License-Identifier: Apache-2.0 WITH LLVM-exception
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*/

#include <@HEADER_NAME@>

#ifdef __cplusplus
extern "C" int main() { return 0; }
#else
int main(void) { return 0; }
#endif
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