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cmake: Fix fallthrough attribute detection

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Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 8c2ad7bdd3)
This commit is contained in:
Andreas Schneider
2018-08-13 09:15:35 +02:00
parent 6708debd4c
commit 500486d501
1 changed files with 11 additions and 13 deletions
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24
ConfigureChecks.cmake
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@@ -267,25 +267,21 @@ int main(void) {
return 0; return 0;
}" HAVE_MSC_THREAD_LOCAL_STORAGE) }" HAVE_MSC_THREAD_LOCAL_STORAGE)
###########################################################
# For detecting attributes we need to treat warnings as
# errors
set(CMAKE_REQUIRED_FLAGS "-Werror")
check_c_source_compiles(" check_c_source_compiles("
#define FALL_THROUGH __attribute__((fallthrough)) #define FALL_THROUGH __attribute__((fallthrough))
enum direction_e {
UP = 0,
DOWN,
};
int main(void) { int main(void) {
enum direction_e key = UP; int i = 2;
int i = 10;
int j = 0;
switch (key) { switch (i) {
case UP: case 0:
i = 5;
FALL_THROUGH; FALL_THROUGH;
case DOWN: case 1:
j = i * 2;
break; break;
default: default:
break; break;
@@ -332,6 +328,8 @@ int main(void) {
return 0; return 0;
}" HAVE_COMPILER__FUNCTION__) }" HAVE_COMPILER__FUNCTION__)
# Stop treating warnings as errors
unset(CMAKE_REQUIRED_FLAGS)
check_c_source_compiles(" check_c_source_compiles("
#define ARRAY_LEN 16 #define ARRAY_LEN 16