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libbpf: Disable SEC pragma macro on GCC 

It seems the gcc preprocessor breaks with pragmas when surrounding
__attribute__.

Disable these pragmas on GCC due to upstream bugs see:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55578
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90400

Fixes errors like:
error: expected identifier or '(' before '#pragma'
  106 | SEC("cgroup/bind6")
      | ^~~

error: expected '=', ',', ';', 'asm' or '__attribute__' before '#pragma'
  114 | char _license[] SEC("license") = "GPL";
      | ^~~

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220706111839.1247911-1-james.hilliard1@gmail.com
This commit is contained in:
James Hilliard 2022-07-06 05:18:38 -06:00 committed by Andrii Nakryiko
parent d1a6edecc1
commit 18410251f6
1 changed files with 13 additions and 0 deletions
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13
tools/lib/bpf/bpf_helpers.h
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@ -22,12 +22,25 @@
* To allow use of SEC() with externs (e.g., for extern .maps declarations),
* make sure __attribute__((unused)) doesn't trigger compilation warning.
*/
#if __GNUC__ && !__clang__
/*
* Pragma macros are broken on GCC
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55578
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90400
*/
#define SEC(name) __attribute__((section(name), used))
#else
#define SEC(name) \
_Pragma("GCC diagnostic push") \
_Pragma("GCC diagnostic ignored \"-Wignored-attributes\"") \
__attribute__((section(name), used)) \
_Pragma("GCC diagnostic pop") \
#endif
/* Avoid 'linux/stddef.h' definition of '__always_inline'. */
#undef __always_inline
#define __always_inline inline __attribute__((always_inline))