32-bit ARM architectures (like armv6l and armv7l) enforce strict
alignment requirements for certain complex variables like `sigjmp_buf`
(which often requires 8-byte alignment due to vector/VFP registers).
When casting the generic `jpeg_error_mgr *` pointer (`jcp->err` which
only
guarantees 4-byte alignment) to the larger internal `ImLib_JPEG_data
*`,
GCC flags an alignment promotion error under `-Werror=cast-align`.
Because `struct jpeg_error_mgr` is guaranteed to be the first member
of `ImLib_JPEG_data`, their memory offsets are structurally identical.
Fix this by routing the cast through an intermediate `void *` pointer,
safely indicating to the compiler that alignment constraints are
respected
and clearing the build failure on 32-bit ARM toolchains.
---
src/modules/loaders/loader_jpeg.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/modules/loaders/loader_jpeg.c
b/src/modules/loaders/loader_jpeg.c
index 75e1ab2..e4a88a2 100644
--- a/src/modules/loaders/loader_jpeg.c
+++ b/src/modules/loaders/loader_jpeg.c
@@ -19,7 +19,7 @@ typedef struct {
static void
_JPEGFatalErrorHandler(j_common_ptr jcp)
{
- ImLib_JPEG_data *jd = (ImLib_JPEG_data *) jcp->err;
+ ImLib_JPEG_data *jd = (ImLib_JPEG_data *)(void *) jcp->err;
#if 0
jcp->err->output_message(jcp);
@@ -31,7 +31,7 @@ static void
_JPEGErrorHandler(j_common_ptr jcp)
{
#if 0
- ImLib_JPEG_data *jd = (ImLib_JPEG_data *) jcp->err;
+ ImLib_JPEG_data *jd = (ImLib_JPEG_data *)(void *) jcp->err;
jcp->err->output_message(jcp);
siglongjmp(jd->setjmp_buffer, 1);
@@ -42,7 +42,7 @@ static void
_JPEGErrorHandler2(j_common_ptr jcp, int msg_level)
{
#if 0
- ImLib_JPEG_data *jd = (ImLib_JPEG_data *) jcp->err;
+ ImLib_JPEG_data *jd = (ImLib_JPEG_data *)(void *) jcp->err;
jcp->err->output_message(jcp);
siglongjmp(jd->setjmp_buffer, 1);
--
2.55.0
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