al_get_shader_log man page
al_get_shader_log — Allegro 5 API Return a read-only string containing the information log for a shader program. The log is updated by certain functions, such as al_attach_shader_source(3) or al_build_shader(3) when there is an error. This function never returns NULL. 5.1.0 al_attach_shader_source(3), al_attach_shader_source_file(3), al_build_shader(3) al_attach_shader_source(3), al_attach_shader_source_file(3), al_build_shader(3).Synopsis
#include <allegro5/allegro.h>
const char *al_get_shader_log(ALLEGRO_SHADER *shader)
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Allegro reference manual